optional<std::string> parseProperty(const char* name, const JSValue& value) {
if (std::string { "text-font" } == name) {
if (!value.IsArray()) {
Log::Warning(Event::ParseStyle, "value of '%s' must be an array of strings", name);
return {};
}
std::string result = "";
for (rapidjson::SizeType i = 0; i < value.Size(); ++i) {
const JSValue& stop = value[i];
if (stop.IsString()) {
result += stop.GetString();
if (i < value.Size()-1) {
result += ",";
}
} else {
Log::Warning(Event::ParseStyle, "text-font members must be strings");
return {};
}
}
return result;
}
if (!value.IsString()) {
Log::Warning(Event::ParseStyle, "value of '%s' must be a string", name);
return {};
}
return std::string { value.GetString(), value.GetStringLength() };
}
void Parser::parseLayers(const JSValue& value) {
std::vector<std::string> ids;
if (!value.IsArray()) {
Log::Warning(Event::ParseStyle, "layers must be an array");
return;
}
for (rapidjson::SizeType i = 0; i < value.Size(); ++i) {
const JSValue& layerValue = value[i];
if (!layerValue.IsObject()) {
Log::Warning(Event::ParseStyle, "layer must be an object");
continue;
}
if (!layerValue.HasMember("id")) {
Log::Warning(Event::ParseStyle, "layer must have an id");
continue;
}
const JSValue& id = layerValue["id"];
if (!id.IsString()) {
Log::Warning(Event::ParseStyle, "layer id must be a string");
continue;
}
const std::string layerID = { id.GetString(), id.GetStringLength() };
if (layersMap.find(layerID) != layersMap.end()) {
Log::Warning(Event::ParseStyle, "duplicate layer id %s", layerID.c_str());
continue;
}
layersMap.emplace(layerID, std::pair<const JSValue&, std::unique_ptr<Layer>> { layerValue, nullptr });
ids.push_back(layerID);
}
for (const auto& id : ids) {
auto it = layersMap.find(id);
parseLayer(it->first,
it->second.first,
it->second.second);
}
for (const auto& id : ids) {
auto it = layersMap.find(id);
if (it->second.second) {
layers.emplace_back(std::move(it->second.second));
}
}
}
optional<std::array<float, 2>> parseProperty(const char* name, const JSValue& value) {
if (value.IsArray() && value.Size() == 2 &&
value[rapidjson::SizeType(0)].IsNumber() &&
value[rapidjson::SizeType(1)].IsNumber()) {
float first = value[rapidjson::SizeType(0)].GetDouble();
float second = value[rapidjson::SizeType(1)].GetDouble();
return { {{ first, second }} };
} else {
Log::Warning(Event::ParseStyle, "value of '%s' must be an array of two numbers", name);
return {};
}
}
optional<std::vector<float>> parseProperty(const char* name, const JSValue& value) {
if (!value.IsArray()) {
Log::Warning(Event::ParseStyle, "value of '%s' must be an array of numbers", name);
return {};
}
std::vector<float> result;
for (rapidjson::SizeType i = 0; i < value.Size(); ++i) {
const JSValue& part = value[i];
if (!part.IsNumber()) {
Log::Warning(Event::ParseStyle, "value of '%s' must be an array of numbers", name);
return {};
}
result.push_back(part.GetDouble());
}
return result;
}
optional<std::vector<std::string>> parseConstant(const char* name, const JSValue& value) {
if (!value.IsArray()) {
Log::Warning(Event::ParseStyle, "value of '%s' must be an array of strings", name);
return {};
}
std::vector<std::string> result;
for (rapidjson::SizeType i = 0; i < value.Size(); ++i) {
const JSValue& part = value[i];
if (!part.IsString()) {
Log::Warning(Event::ParseStyle, "value of '%s' must be an array of strings", name);
return {};
}
result.push_back({ part.GetString(), part.GetStringLength() });
}
return result;
}
optional<std::vector<std::pair<float, T>>> parseStops(const char* name, const JSValue& value) {
if (!value.IsArray()) {
Log::Warning(Event::ParseStyle, "stops function must specify a stops array");
return {};
}
std::vector<std::pair<float, T>> stops;
for (rapidjson::SizeType i = 0; i < value.Size(); ++i) {
const JSValue& stop = value[i];
if (!stop.IsArray()) {
Log::Warning(Event::ParseStyle, "function argument must be a numeric value");
return {};
}
if (stop.Size() != 2) {
Log::Warning(Event::ParseStyle, "stop must have zoom level and value specification");
return {};
}
const JSValue& z = stop[rapidjson::SizeType(0)];
if (!z.IsNumber()) {
Log::Warning(Event::ParseStyle, "zoom level in stop must be a number");
return {};
}
optional<T> v = parseProperty<T>(name, stop[rapidjson::SizeType(1)]);
if (!v) {
return {};
}
stops.emplace_back(z.GetDouble(), *v);
}
return stops;
}